A complete structure includes the table element itself, a row (), and a cell (). The option provides exactly those tags, while the other choices contain non‑table elements or malformed tags.

The background attribute on the element sets a page background image in traditional HTML. Modern practice uses CSS, but this syntax remains valid. and are not real HTML elements.

The tag with src attribute is the correct syntax for images. It is a self-closing element ending with /> in XHTML. is not valid, the path goes in src not href, and does not wrap content.

The element with type='text' creates a single-line text input field. The type value must be 'text', not 'textfield'. and are not valid HTML elements.

SQL Injection involves inserting malicious SQL code into input fields like search boxes. The 'crafted code' causes the database to execute unintended queries, returning excessive data ('massive amount of result') and slowing response time. Social engineering tricks people, log injection targets logs, and reflected XSS requires script execution in responses.

Javadoc @param tags should follow the same order as parameters appear in the method or constructor declaration. This convention ensures documentation consistency with the actual code signature, making it easier for developers to correlate documentation with implementation.